<template>
    <div>
        <!-- 面包屑导航区 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>商品分类</el-breadcrumb-item>
        </el-breadcrumb>

        <!-- 卡片视图 -->
        <el-card>
            <el-row>
                <el-col>
                    <el-button type="primary" @click="shouAddCateDialog">添加分类</el-button>
                </el-col>
            </el-row>
            <!-- 表格 -->
            <tree-table :data="catelist"  class="treeTable"
            :columns="columns" 
            :selection-type="false" 
            :expand-type="false"
            show-index
            index-text="#"
            border :show-row-hover="false"> 

            <!-- 自定义模板 -->
            <template slot="isok" slot-scope="scope">
                <i class="el-icon-success" v-if="scope.row.cat_deleted === false"
                style="color: lightgreen;"></i>
                <i class="el-icon-error" v-else style="color: lightgreen;"></i>
            </template>

            <template slot="order" slot-scope="scope">
                <el-tag size="mini"  v-if="scope.row.cat_level===0">一级</el-tag>
                <el-tag type="success" size="mini"  v-else-if="scope.row.cat_level===1">二级</el-tag>
                <el-tag type="warning" size="mini" v-else>三级</el-tag>
            </template>

             <template slot="opt" slot-scope="scope">
                <el-button type="primary" icon="el-icon-edit" size="mini">编辑</el-button>
                <el-button type="danger" icon="el-icon-delete" size="mini" ty>删除</el-button>
            </template>
            </tree-table>
            
            <!-- 分页 -->
            <el-pagination
              @size-change="handleSizeChange"
              @current-change="handleCurrentChange"
              :current-page="queryInfo.pagenum"
              :page-sizes="[3, 5, 10, 15]"
              :page-size="queryInfo.pagesize"
              layout="total, sizes, prev, pager, next, jumper"
              :total="total">
            </el-pagination>
        </el-card>

        <!-- 添加分类的对话框 -->
        <el-dialog
          title="添加分类"
          :visible.sync="addCatedialogVisible"
           width="50%" @close="addCateFormClosed">

          <!-- 添加分类表单 -->
          <el-form :model="addCateForm" 
          :rules="addCateFormRules" ref="addCateFormRef" 
          label-width="100px" >
              <el-form-item label="分类名称:" prop="cat_name">
              <el-input v-model="addCateForm.cat_name"></el-input>
              </el-form-item>

               <el-form-item label="父级分类:">
                   <el-cascader
                       expand-trigger="hover"
                       v-model="selectKeys"
                       :options="parentCateList"
                       :props="cascaderProps"
                       @change="parentCateChanged" 
                       clearable change-on-select></el-cascader>
              </el-form-item>

          </el-form>

          <span slot="footer" class="dialog-footer">
            <el-button @click="addCatedialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="addCate">确 定</el-button>
          </span>
        </el-dialog>

    </div>
</template>

<script>
export default {
    data(){
        return{
            queryInfo:{
                type: 3,
                pagenum:1,
                pagesize:5
            },

            // 商品分类列表
            catelist:[],
            total:0,
            columns:[
                {
                    label:'分类名称',
                    prop:'cat_name'

                },
                {
                    label:'是否有效',
                    type:'template',
                    template:'isok'

                },
                {
                    label:'排序',
                    type:'template',
                    template:'order'

                },
                {
                    label:'操作',
                    type:'template',
                    template:'opt'

                }
            ],
            addCatedialogVisible:false,
            addCateForm:{
                // 将要添加的分类名称
                cat_name:'',
                cat_pid: 0,
                cat_level: 0
            },
            addCateFormRules:{
                cat_name:[
                    {required: true, 
                    message:'请输入分类名称',
                     trigger:'blur'}
                ]
            },
            parentCateList:[],
            cascaderProps:{
                value:'cat_id',
                label:'cat_name',
                children:'children',

            },
            selectKeys:[]
        }
    },
    created(){
         this.getCateList()
    },
    methods:{
         async getCateList(){
            const {data: res} = await this.$http.get('categories', {params: this.queryInfo})

            if(res.meta.status !==200){
                return this.$message.error('获取商品分类失败')
            }
            
            this.catelist = res.data.result
            this.total = res.data.total
         },
        //  分页监听事件
         handleSizeChange(newSize){
         this.queryInfo.pagesize=newSize
         this.getCateList()
         },
         handleCurrentChange(newPage){
         this.queryInfo.pagenum=newPage
         this.getCateList()
         },
         
         shouAddCateDialog(){
             this.getParentCateList()
             this.addCatedialogVisible=true
         },
         async getParentCateList(){
            const {data:res} = await this.$http.get
            ('categories',{params:{type:2}})

            if(res.meta.status !==200){
                return this.$message.error('获取父级分类数据失败')
            }

           this.parentCateList=res.data
         },
         parentCateChanged(){
             console.log(this.selectKeys)
             //如果selectKeys 数据length 大于0  证明选中了
             if(this.selectKeys.length>0){
                this.addCateForm.cat_pid = this.selectKeys[this.selectKeys.length-1]

                this.addCateForm.cat_level = this.selectKeys.length

                return 
             }
             else{
                 this.addCateForm.cat_level = 0
                 this.addCateForm.cat_pid = 0
             }
         },
         addCate(){
             this.$refs.addCateFormRef.validate( async valid =>{
              if(!valid) return
              const {data:res} = await this.$http.post('categories',
              this.addCateForm)

              if(res.meta.status !==201){
                  return this.$message.error('添加分类失败')
              }
                 this.$message.success('添加分类成功')
                 this.getCateList()
                 this.addCatedialogVisible = false
             })

        console.log(this.addCateForm)
         },
         addCateFormClosed(){
             //监听对话框的关闭事件，重置表单数据
             this.$refs.addCateFormRef.resetFields()
             this.selectKeys = []
             this.addCateForm.cat_level=0
             this.addCateForm.cat_pid=0
         }


    }
}
</script>


<style  lang="less" scoped>
.treeTable{
    margin-top: 15px;
}

</style>